Formation Mechanism of Secondary Quartz and Its Influence on Physical Properties of Xu 2 Member Reservoir in Western Sichuan Depression

doi:10.7657/XJPG20230104

Abstract

Abstract:

Secondary quartz cement is one of the important authigenic minerals affecting the physical properties of the second member of Xujiahe formation (Xu 2 member) reservoir in the Western Sichuan depression. In order to clarify the formation mechanism of secondary quartz and search for high-quality reservoirs，the silica source of secondary quartz in the Xu 2 member sandstone and its effect on the reservoir were analyzed by experimental methods such as casting thin section，scanning electron microscopy (SEM)，cathodoluminescence，inclusion temperature measurement，and quartz oxygen isotopes. The secondary quartz in the sandstone of Xu 2 member can be divided into 3 stages. The silica formed by the dissolution of K-feldspar and acid plagioclase with the participation of early atmospheric fresh water and organic acid is the main contributor to the formation of secondary quartz in the early-middle diagenetic stage. The silica produced by the compaction and pressolution in the sandstone and the transformation of clay minerals is a key cause for the formation of secondary quartz at relatively high temperatures in the middle-late diagenetic stage. Although the early secondary quartz occupies a part of the pores，the mechanical strength of the rock can be enhanced to inhibit the compaction，which is beneficial to the preservation of primary pores. The secondary quartz formed in the middle-late diagenetic stages was mostly the product of dissolution and pressolution and occupies the dissolution pores and primary pores，which is an important factor for reservoir densification.

Key words: Western Sichuan depression, Xujiahe formation, secondary quartz, inclusion, oxygen isotope ratio, silica, formation mechanism, influencing factor

CLC Number:

TE122.2

ZHANG Shunli, YANG Yingtao, ZHANG Ling, CAO Yanhui. Formation Mechanism of Secondary Quartz and Its Influence on Physical Properties of Xu 2 Member Reservoir in Western Sichuan Depression[J]. Xinjiang Petroleum Geology, 2023, 44(1): 25-32.

Figures/Tables 8

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